Gauging block for drill-bit-sharpening machines



Jan. 13, 1931. c. w. MITCHELL 1,788,532

GAUGINQ' BLOCK FOR DRILL BIT SHARPENING MACHINES Filed June 14, 1928 2 Sheets-Sheet 1 Inventor jam 9 1931- (i. w. MITCHELL 1,788,682

GAUGING BLOCK FOR DRILL BIT SHARPENING MACHINES Filed June i i, 1928 2 sheets-sneet' 2 Inventor V Patented Jan. 13, I

f fiieis's wiim'mimmnm, on IJIORENCZF, AaizoiI-A G AIJ 'GING shock niiinnsrr-sininrnnine l Appl i eati on led Jmnfmz;seal, No. geaierff p n i l a drill steel sharpening machine,such as the i Well known Leyner machine and above which i f i is disposed ithepunch head 6''operatively a I V moui'ited on the plunger 7 andconnect'ed with j 7 "Thepresent invention relates to gauging blocks used in connection With the manufacture of rock drill bits andhas' for its'principal object to provide" an adjustable" means Zia fligures '5 and 6 are the upperfand lower gauging blocks. 1 7 Referring now to the drawingfin detail,- i Whereas forthe'purpo'se of illustration} have r disclosed a preferred embodiment of-i'ny im 50 ventiomthe numeral 5 illustrates the 'tableo-fj 7b 'for regu'latingthe size of the bit Whilecrimping thesameby the sharpening machine.

Astill further object is to provide a'pair of cooperating {gauging bloeksadapted to form. the bit to an accurate diameter; after i w the.- samexhas been dollied and fo m -a f s I v i I i A stillffurther object is to provide a gauge of this eharacter de signed for use particlev larly in connection with the Leyner drillbit 5' sharpening machine.

, l'An additional object of this invention is to provide a device of this character of a simple and practical construction, which is strong and durable, V eiiicient and reliable in lperformance 'which is -readily adjustable to a form the'abit'in'to varioussizes'of airelatively '.wide range,zwhich is "relatively ine ipensive to manufacture and installin operative position and otherwise ell adapted for the purg pose forwhich the s me is intended."

other je fil iladvantages reside in the I special construction, "combination and l er rangem'ent of parts forming the inventlonfas more fullyhereinafter described and-claimed; s reference being had to the accoinpanying drawings forming partqhereof,vvherein like numerals refer to like parts throughout, and invvhich:

a In the drawings: a

3 V Figure'l is fragmentary side ele'vational view .off'a "sharpener machine showing the gauge v1n operative posltion thereon,

' I I Figure 2 is a rear end elevational' view of the box comprising the gauge, 7

gauge boX,

FIgUIQ l: 1S a| vertical transverse sectional of Figurell', and;

asuit'able source ofpower for moving the from thedge thereof;

.Figure 3 is a top 'plan vieW of the lower perspective vievv js i-of punch head downwardly; toward the table. 'Uponthe table-5 is arranged anindexbar :8}

.ofsubstantialIy li -shaped formation assho vn l 1n F g-meteor the drawing, said 1ndeXbar being 'disposed in f hq izomai Jpositio'n' and 5 Withgits" closed end proj eetingl slightly outv vardly fromthe edge ofthetablejand having v its'parallel; sides ,9 provided with longitudi- V 6 Daily extending slotted openings 10.

i Within each of the-slotted openings is arranged an .adj ustin'g bolt 11 having their inner ends threadedly inserted in openings; f'or'in'edfin the opposite i side edges "of a loWer clamping block 12 secured'fagainst the outer. I face'of the table'5bya boltlS. The cla mpi i 70 block 12-is thus fixedly attached to thei tableand by reason of the bolt 11 extendingoutwardly fromfthej opposite] side edges thereof and carried inthe s'lotted 'op'ening 10,the.index barSimaythilsbe adjusted in-j t ar l i h re time;

YfThe innergnp er edge of thef-cla'mpingt' block'lZ is formed into a reduced shoulder I if '14;;adapted to form 'ajsupport for anliezgten; 'sio'n '1 5 for'1nedat the "upplejr edge of one s end f owe -gal geblo k 'lfi-j e ppbsi f j hfg 'u l ck fi 'p ed Wit pair ofdovvel pins 17 adapted to Seat Within recesses; formje d iinqan abutment 18 extend jrdlyrfrom thej table 5 inwardly '1' The! gauge block 16 fis offla substantially wedgeshaped 'formationwithits lowerg sur- 1 face restil'i'g' upon thetabi t audits upper 5 v u fa eiiil edide nw d yi n f'in d t Theinnerfend" ofifthe 'g augeblockflfi is disposedflushvviththei neli and 0f the [L -Shaped j g'ro. theouter edge r the punchhead 6} is 95 1 "secured an upper clamping. block bolt- 20,- said upperfclainpingblockserving tosecure"an upper gauge blockl21tothe un-f I that the entire portion of the bit disposed bits of various diameters. 5

with a pair of dowel pins 22 seated in recesses formed in anabutment 23 depending from posed immediately beneath the upper clampin block 19. and said u 361 au e block is likewise of a substantially wedge shaped formation with its lowersurtace inclined upwardly and inwardly. I

The upper and lower gauge blocksltl and 21 are of a duplicate formation and are secured to the machine in a manner so that their inclined faces will engage the opposite sides of the flared end of the drillbit 25. The bit en a in faces of the au 'e block ad'acent b b 23 O '3 7 l.

their outeredgesare concaved as shown at 26 for accommodating the shank of the bit so between the gauge block'is ei'igaged atoppo These ably mounting other blocks provided. with concavities of VZLllOLlS sizes to accommodate 7 The upperedge ofthe index the outer end thereofland the npper'edge of the lower clamping block 12 are likewise Con caved as shown at 28 and 29 respectively to; 'also accornmodatethe shank 27., At'the in-' ner end of the index bar 8 is arranged a bit stop" 30 arranged to engage'the center. of the inner end of thebit 25, said bit stop being 'adjustably mounted on a substantially 'U-sh'ap'ed yoke 31 invertedly arranged. and

with its opposite ends sliding verticallywithin recesses formed in the upper surface of the. opposite end of, the index bar 8.

' 'Th'e yoke 3lithusexte1ids transversely of the lower gauge block 16 and the bit stop s arranged. for sl ding movement upon the yoke 31 so as to provide for the transverse adjustment of the stop with respect to' the sides ofthe index bar. The bit stop maybe secured in adjusted position by a set screw 32.

' The yoke 31 is secured in verticallyadjusted position by setscrews' 33' threaded in the in'dexbar'an'd engageable with the respective ends of the yoke. The stop may thus be readily adjusted for centering-the same with re-.

spect to the bit. Theupper surface of each side of the index bar 8 is provided with a scale 34 cooperating with a set mark 35 formed on the upper edge of the lower clampingblock 12 for adjusting the index .bar and i as a consequence the bit stop whereby to regu late the position at which it is placedlbetween the gauge block for crimping thesame to a predetermined size, fo'r'sha'ping and forming thelength and degree of the flared portion at ening machines comprising a pair of clampng blocks attachable respectively to the table and punch head" of the 'inachlne, gauging blocks removably secured in hit crimping position bysaid clamping blocks and having seats of predetermined capacity, a U-shaped.

, index bar, means for adj ustably mounting the same on one of said clamping blocks, a bit stop carried by said index bar, means for adjusting said bit stop vertically and transversely with respect to said index bar for centering thestop with respect to the bit.

2. A bit gauging attachment for bit sharpening machines comprising a pair of clamp.- ing blocks attachable respectively to the table andpunch head of the machine, gauging blocks removably securedin bit crimping position by said clamping blocks and having seats of predetermined; capacity, av horizontally disposed, U-shaped index bar, means for adj ustably mounting the same on one of said clamping blocksproviding or the adjustment thereof relative to the gauging block, a bit stop, an invertedl y arranged U-shaped supporting yoke for said bitstop having its ends 'supportedat the" inner end of said index bar, means for vertically adjusting said yoke V with respect to said bar, and means for transversely adjusting said bit stop on said yoke, transversely of said bar forcentering the stop with respect to the bit. if;

' In testimon whereof I afiix my signature CHARLEL WVILLMER MITCHELL.

llO

the inner end of the bit. :It is understood the length thereof is heatedto a forging heat,

that when placingthe/inventionin practice; I 

